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For the time being, you have to look at the code.

It is fairly well documented and straight forward (if you know C++ and OOP).

Start with an object which is similar to what you want and derive a new class.

The biggest issue right now is how to load in GEM as a DSO/DLL. For SGIs?, you will need to setenv LD_LIBRARY_PATH. On NT, you will need to have your path include the directory with GEM.